Boat trailer
FIG. 1 is a side elevational view of a boat trailer showing my new design, it being understood that the broken lines are for illustrative purposes only and form no part of the claimed design; 
     FIG. 2 is a front elevational view thereof; 
     FIG. 3 is a rear elevational view thereof; 
     FIG. 4 is a side elevational view thereof; 
     FIG. 5 is a top plan view thereof; 
     FIG. 6 is a bottom plan view thereof; and 
     FIG. 7 is a side elevational view opposite to that shown in FIG. 4.